Get rid of Chromium in build-dumprendertree
https://bugs.webkit.org/show_bug.cgi?id=115212

Patch by Seokju Kwon <seokju.kwon@gmail.com> on 2013-04-25
Reviewed by Dirk Pranke.

* Scripts/build-dumprendertree:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@149163 268f45cc-cd09-0410-ab3c-d52691b4dbfc